2017-06-12 23:10 GMT+03:00 Hesham Almatary <heshamelmat...@gmail.com>:
> > > On Tue, Jun 13, 2017 at 2:09 AM, Denis Obrezkov <denisobrez...@gmail.com> > wrote: > > Hello all, > > > > I was able to debug my program on top of HiFive1 board. > > I found out that I can't use next and until commands from gdb, > > they just hang gdb. > > And now I have a problem, this is my backtrace: > > > > #0 0x2041d728 in _User_extensions_Iterate (arg=0x80002eb8, > > visitor=0x2041d64e <_User_extensions_Fatal_visitor>, > > direction=CHAIN_ITERATOR_FORWARD) > > at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/../../cpukit/score/src/userextiterate.c:155 > > #1 0x20410ed4 in _User_extensions_Fatal (source=INTERNAL_ERROR_CORE, > > error=2) at > > ../../cpukit/../../../hifive1/lib/include/rtems/score/userextimpl.h:307 > > #2 0x20410ef8 in _Terminate (the_source=INTERNAL_ERROR_CORE, > the_error=2) > > at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/../../cpukit/score/src/interr.c:35 > > #3 0x20410f40 in _Internal_error > > (core_error=INTERNAL_ERROR_TOO_LITTLE_WORKSPACE) at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/../../cpukit/score/src/interr.c:44 > > #4 0x2041e484 in _Workspace_Handler_initialization (areas=0x80002f78, > > area_count=1, extend=0x0) at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/../../cpukit/score/src/wkspace.c:123 > > #5 0x2040031c in bsp_work_area_initialize_default > (area_begin=0x80001d58, > > area_size=8872) at > > ../../../../../.././hifive1/lib/include/bsp/bootcard.h:147 > > #6 0x20400372 in bsp_work_area_initialize () at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/lib/libbsp/riscv32/hifive1/../../ > shared/bspgetworkarea.c:61 > > #7 0x2040f3ce in rtems_initialize_executive () at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/../../cpukit/sapi/src/exinit.c:95 > > #8 0x204002cc in boot_card (cmdline=0x0) at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/lib/libbsp/riscv32/hifive1/../../ > shared/bootcard.c:76 > > #9 0x20400064 in _end_clear_bss () at > > /home/reprofy/Projects/riscv/rtems/development/rtems/ > kernel/rtems-riscv/c/src/lib/libbsp/riscv32/hifive1/start/start.S:116 > > > > So, I think I should increase a workspace. > > Now, I have some questions: > > I took Hesham's linker file for riscv-generic, and there were no stack > > space, > > I allocated 0x1000 for stack. Should I make it zero again, or should I > > decrease its size? > > what size for stack should be enough? > >> /* >> * The stack section will occupy the remaining >> REGION_STACK region and may >> * contain the task stacks. Depending on the region >> distribution this >> * section may be of zero size. >> */ >> > This means that the stack_end address is starting at your very top address > space (i.e. 16KiB if you set your linker size to 16KiB). The stack grows > dynamically downwards, so it might overflow other sections (e.g. work, > heap, data, etc) if you don't have enough memory size to fit. You can try > to see how much size each section occupies (riscv32-rtems4.12-objdump -h > hello.exe), especially work space. > > > > And why there were no space for stack? is it possible to work without > stack > > allocated in > > linkcmd file? > > Can RTEMS work with a smaller workspace? > > > As far as I remember, 4KiB was the smallest I could allocate for workspace > to work (with Epiphany). As I suggested before, you might want to start > saving up memory by using the local instruction memory (on HiFive) and > compressed version of RISC-V ISA. > > > -- > > Regards, Denis Obrezkov > > > > -- > Hesha > I think that problem is that my bss section spends 0x1440 byte. And rtems requires its workspace to be about 15 KiB. (I have an error in wkspace.c:137 - 'remaining' is 7024 during the error). And I am not sure is it possible to store bss in ITIM, details can be found in E31 Coreplex manual, 3.1. I've tried to push bss to ITIM, but I had errors during clearing it. Do you think compressed ISA will help? or, how can we reduce the size of the required space? -- Regards, Denis Obrezkov
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